Abstract:
:The large spin Hall effect in topological insulators (TIs) is very attractive for ultralow-power spintronic devices. However, evaluation of the spin Hall angle and spin-orbit torque (SOT) of TIs is usually performed on high-quality single-crystalline TI thin films grown on dedicated III-V semiconductor substrates. Here, we report on room-temperature ultralow power SOT magnetization switching of a ferrimagnetic layer by non-epitaxial BiSb TI thin films deposited on Si/SiO2 substrates. We show that non-epitaxial BiSb thin films outperform heavy metals and other epitaxial TI thin films in terms of the effective spin Hall angle and switching current density by one to nearly two orders of magnitude. The critical SOT switching current density in BiSb is as low as 7 × 104 A/cm2 at room temperature. The robustness of BiSb against crystal defects demonstrate its potential applications to SOT-based spintronic devices.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Khang NHD,Nakano S,Shirokura T,Miyamoto Y,Hai PNdoi
10.1038/s41598-020-69027-6subject
Has Abstractpub_date
2020-07-22 00:00:00pages
12185issue
1issn
2045-2322pii
10.1038/s41598-020-69027-6journal_volume
10pub_type
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